Userland: Add the BuggieBox program

This will be our alternative to what is known as BusyBox for Linux
distributions.

Co-Authored-By: Tim Schumacher <timschumi@gmx.de>

Userland/BuggieBox/CMakeLists.txt

@@ -0,0 +1,51 @@
+serenity_component(
+    BuggieBox
+    REQUIRED
+    TARGETS BuggieBox
+)
+
+function (buggiebox_utility src)
+    get_filename_component(utility ${src} NAME_WE)
+    target_sources(BuggieBox PRIVATE ${src})
+    set_source_files_properties(${src} PROPERTIES COMPILE_DEFINITIONS "serenity_main=${utility}_main")
+endfunction()
+
+set(utility_srcs
+    ../Utilities/cat.cpp
+    ../Utilities/checksum.cpp
+    ../Utilities/chmod.cpp
+    ../Utilities/chown.cpp
+    ../Utilities/cp.cpp
+    ../Utilities/df.cpp
+    ../Utilities/env.cpp
+    ../Utilities/file.cpp
+    ../Utilities/find.cpp
+    ../Utilities/id.cpp
+    ../Utilities/less.cpp
+    ../Utilities/ln.cpp
+    ../Utilities/ls.cpp
+    ../Utilities/lsblk.cpp
+    ../Utilities/mkdir.cpp
+    ../Utilities/mknod.cpp
+    ../Utilities/mount.cpp
+    ../Utilities/mv.cpp
+    ../Utilities/ps.cpp
+    ../Utilities/rm.cpp
+    ../Utilities/rmdir.cpp
+    ../Utilities/tail.cpp
+    ../Utilities/tree.cpp
+    ../Utilities/umount.cpp
+    ../Utilities/uname.cpp
+    ../Utilities/uniq.cpp
+)
+
+serenity_bin(BuggieBox)
+target_sources(BuggieBox PRIVATE main.cpp)
+target_link_libraries(BuggieBox PRIVATE LibMain LibShell LibCompress LibCore LibCrypto LibGfx LibLine LibRegex)
+
+foreach(file IN LISTS utility_srcs)
+   buggiebox_utility(${file})
+endforeach()
+
+target_sources(BuggieBox PRIVATE ../Shell/main.cpp)
+set_source_files_properties( ../Shell/main.cpp PROPERTIES COMPILE_DEFINITIONS "serenity_main=sh_main")

Userland/BuggieBox/main.cpp

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ * Copyright (c) 2022, Tim Schumacher <timschumi@gmx.de>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/LexicalPath.h>
+#include <LibMain/Main.h>
+#include <Userland/Shell/Shell.h>
+
+#define ENUMERATE_UTILITIES(E) \
+    E(cat)                     \
+    E(checksum)                \
+    E(chmod)                   \
+    E(chown)                   \
+    E(cp)                      \
+    E(df)                      \
+    E(env)                     \
+    E(file)                    \
+    E(find)                    \
+    E(id)                      \
+    E(less)                    \
+    E(ln)                      \
+    E(ls)                      \
+    E(lsblk)                   \
+    E(mkdir)                   \
+    E(mknod)                   \
+    E(mount)                   \
+    E(mv)                      \
+    E(ps)                      \
+    E(rm)                      \
+    E(sh)                      \
+    E(rmdir)                   \
+    E(tail)                    \
+    E(tree)                    \
+    E(umount)                  \
+    E(uname)                   \
+    E(uniq)
+
+// Declare the entrypoints of all the tools that we delegate to.
+// Relying on `decltype(serenity_main)` ensures that we always stay consistent with the `serenity_main` signature.
+#define DECLARE_ENTRYPOINT(name) decltype(serenity_main) name##_main;
+ENUMERATE_UTILITIES(DECLARE_ENTRYPOINT)
+#undef DECLARE_ENTRYPOINT
+
+static void fail()
+{
+    out(stderr, "Direct running of BuggieBox was detected without finding a proper requested utility.\n");
+    out(stderr, "The following programs are supported: uname, env, lsblk, file, df, mount, umount, mkdir, ");
+    out(stderr, "rmdir, rm, chown, chmod, cp, ln, ls, mv, cat, md5sum, sha1sum, sha256sum, sha512sum, sh, uniq, id, tail, ");
+    out(stderr, "find, less, mknod, ps\n");
+    out(stderr, "To use one of these included utilities, create a symbolic link with the target being this binary, and ensure the basename");
+    out(stderr, "is included within.\n");
+}
+
+struct Runner {
+    StringView name;
+    ErrorOr<int> (*func)(Main::Arguments arguments) = nullptr;
+};
+
+static constexpr Runner s_runners[] = {
+#define RUNNER_ENTRY(name) { #name##sv, name##_main },
+    ENUMERATE_UTILITIES(RUNNER_ENTRY)
+#undef RUNNER_ENTRY
+
+    // Some tools have additional aliases.
+    { "md5sum"sv, checksum_main },
+    { "sha1sum"sv, checksum_main },
+    { "sha256sum"sv, checksum_main },
+    { "sha512sum"sv, checksum_main },
+    { "Shell"sv, sh_main },
+};
+
+static ErrorOr<int> run_program(Main::Arguments arguments, LexicalPath const& runbase, bool& found_runner)
+{
+    for (auto& runner : s_runners) {
+        if (runbase.basename() == runner.name) {
+            found_runner = true;
+            return runner.func(arguments);
+        }
+    }
+    return 0;
+}
+
+static ErrorOr<int> buggiebox_main(Main::Arguments arguments)
+{
+    if (arguments.argc == 0) {
+        fail();
+        return 1;
+    }
+    bool found_runner = false;
+    LexicalPath runbase { arguments.strings[0] };
+    auto result = TRY(run_program(arguments, runbase, found_runner));
+    if (!found_runner)
+        fail();
+    return result;
+}
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    LexicalPath runbase { arguments.strings[0] };
+    if (runbase.basename() == "BuggieBox"sv) {
+        Main::Arguments utility_arguments = arguments;
+        utility_arguments.argc--;
+        utility_arguments.argv++;
+        utility_arguments.strings = arguments.strings.slice(1);
+        return buggiebox_main(utility_arguments);
+    }
+    return buggiebox_main(arguments);
+}

Userland/CMakeLists.txt

@@ -22,6 +22,7 @@ add_subdirectory(DevTools)
 add_subdirectory(DynamicLoader)
 add_subdirectory(Games)
 add_subdirectory(Libraries)
+add_subdirectory(BuggieBox)
 add_subdirectory(Applets)
 add_subdirectory(Services)
 add_subdirectory(Shell)